Heater or boiler.



No. 703,685. Patented July I, I902.

N. B. WALE'S.

HEATER 0R BOILER.

(Application filed Apr. 2, 1902;

(No Model.)

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UNITED STATES PATENT OFFICE.

NATHANIEL B. wA-L s, OF BRAINTEEE, MASSACHUSETTS.

HEATER OR BOILER.

SPECIFICATION forming part of Letters Patent No. 703,685, dated July 1, 1902.

Application filed April 2,1902. Serial No. 101,076. (No model.)

To aZZ whom it may concern: 1

Be it known that I, NATHANIEL B. WALEs, of Braintree, in the county'of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Hot- Water Heaters and Steam-Boilers, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to hot-water heaters and steam-boilers; and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the description of the accompanying drawings and to the claims hereto appended and in-which my invention is clearly pointed out.

Figure 1 is a front elevation of a hot-water heater embodying my invention. Fig. 2 is a central vertical section on line A A on Fig. 1. Fig. 3 is a sectional plan, the cuttingplane being on line B B on Fig. 2. Fig. 4 is a sectional plan of the upper water-chamber, the cutting-plane being on line C O on Fig. 1. Fig. 5 is an inverted plan of the lower water-chamber, which surrounds the fire-box.

In the drawings, 1 is the main casing of the heater, which may be of metal, as indicated, or of brick. v

2 is the fire-box, surrounded by the waterchamber 3, the inner wall of which is inclined inward or made in the form of a hollow frustum of a cone and extends upward a short distance above the annular upper plate of said chamber, as shown at 4 in Fig. 2.

The grate 5 is supported upon the inwardlyprojecting plate 6, which forms the lowerannular plate of the chamber 3.

7 is the ash-pit, and 8 is the ash-pit door,

and 9 is the fire-door, of well-known construction.

Supported upon and connectingwith the interior of the water-chamber 3 at 10 is the water-tube 11, in the form of a frusto-conical coil, extending upward approximately five-sevenths of the distance from theupper surface of the chamber 3 to the upper head of the main casing and communicating at its upper end with the water-chamber 12 at 13, v

as shown in Fig. 2.

The water-chamber 12 is supported in any well-known manner in a position intermediate between the upperend of the coil 11 and the upper head of the main casing 1 and has secured thereto, depending therefrom, and communicating therewith at 14, the frustoconical tubular coil 15, which extendsdownward therefrom to within a short distance of the top plateof the water-chamber 3, with which chamber its lower end communicates at 16, thesaid coil-15 being supported upon a series of standards 17, the lower ends of which rest upon and are secured to the upper plate of the chamber 3, as indicated in Fig. 2, partly in full lines and partly in dotted lines. The-several convolutions of the frusto-conical coils 11 and-15 are laid in close contact with each other, so that said coils form annular diaphragms inclosing the upward and downward passages for the hot gases on their Way to the chimney 18. By this construction and arrangement of the coils 11 and 15, the frusto-conical fire-box 2, and

the Water-chambers 3 and12 a very largeamount of heating-surface is obtained, as the entire exterior surfaces of the water-chamber 12 and of the coils l1 and15 are exposed to the direct action of the products of combustion, and-the inclined inner surface of the wall of the fire-box, which also forms the innor wall of the water-chamber 3, is much more effective as heating-surface than if said wall were perpendicular A feed, blow-off, and water-return pipe 19 enters the water-chamber 3 near its bottom, asshown in Fig. 2, and the water-chamber '12 has an outlet through the pipe 20, which connects with the water circulating pipe when the apparatus is used as a heater or is the steam-supply pipe when used as a steamboiler.

The hot gases or products of combustion pass upward within the coil 11 over the top of the same, downward between the coils 11 and 15, under the lower end of the latter, upward outside of said coil 15, and around the periphery and over the top of the water-chamber 12, and then escape into the'chimney 18.

So far I have described my'in'vention as it will be constructed for use as a heater; but the same construction may be used as an ordinary steam-boiler by simply adding thereto the steam and water gages 21 and 22, the circulation-pipe 23, and the pressure-gage 24, when the chamber 12 would become a steam- ICO drum and the water-level would be between the upper convolution of the coil 11 and the chamber 12.

The operation of my invention will be readily understood from the foregoing without further description here.

hat I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a water-heater, the combination of a fire-box the wall of which is frusto-conical; a water-chamber surrounding said fire-box; a second water-chamber located near the top of the inclosing casing; a frusto-conical tubular coil, the larger end of which rests upon, and communicates with the interior of the chamber surrounding said fire-box, and ex tends upward to within a short distance of the under side of said upper water-chamber, and communicates with the interior thereof; a second frusto-conical tubular coil surrounding said first-mentioned coil at a distance therefrom, with its upper and smaller end in contact with, and in communication with the interior of said upper chamber, and extending downward therefrom to within a short distance of, and communicating with the interior of the water-chamber surrounding the fire-box; means for admitting water to said fire-box water-chamber; and means for the discharge of water from said upper waterchamber.

2. The combination of a frusto-conical firebox; a water-chamber inclosing said fire-box the water-chamber 12; the frusto-conical tubular coils 11 and 15, the convolutions of each coil being wound in close contact with each other, said coils being arranged one within the other, and at a greater distance apart at their upper ends than at their lower ends, said coil 11 resting upon and communicating at its lower end with the interior of said firebox water-chamber and extending upward to within a short distance of the under side of the chamber 12, and communicating at its upper end with the interior of said chamber 12, and said coil 15 being in contact with the under side of, and communicating with the interior of said chamber 12, and at its lower end with the interior of the chamber surrounding the fire-box; and a series of standards interposed between the upper surface of the water-chamber 3 and the lower end of the coil 15, as and for the purposes described.

3. In a water-heater, the combination of a frusto-conical fire-box; the Water-chamber 3, surroundingsaid fire-box, but havingaheight less than the wall of the fire-box; the closelywound frusto-conical tubular coils 11 and 15, arranged one within the other, at a diverging distance apart, the lower convolution of the coil 11 fitting closely around the upwardlyprojecting portion of the fire-box wall, and said coils being arranged relative to each other and to the water-chambers 3 and 12 as set forth; the feed-pipe 19; the dischargepipe 20; the inclosing casing 1; and the chimney 18.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 1st day of April, A. D. 1902.

NATHANIEL B. WALES.

\Vitnesses:

N. O. LOMBARD, J. K. STERLING. 

